ns-topenv

Finding the top level environment from an environment envir and its enclosing environments.

Syntax

R Copy

topenv(envir = parent.frame(),
       matchThisEnv = getOption("topLevelEnvironment"))

Arguments

Parameter	Description
envir	environment.
matchThisEnv	return this environment, if it matches before any other criterion is satisfied. The default, the option topLevelEnvironment, is set by sys.source, which treats a specific environment as the top level environment. Supplying the argument as NULL means it will never match.

Details

topenv returns the first top level environment found when searching envir and its enclosing environments. An environment is considered top level if it is the internal environment of a namespace, a package environment in the search path, or .GlobalEnv .

Examples

Example

R Copy

# NOT RUN {
topenv(.GlobalEnv)
topenv(new.env()) # also global env
topenv(environment(ls))# namespace:base
topenv(environment(lm))# namespace:stats
# }

See Also

environment notably parent.env() on “enclosing environments”; loadNamespace for more on namespaces.